package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

@RestController
@Slf4j
@RequestMapping("/shoppingCart")
public class ShoppingCartController {
	@Autowired
	private ShoppingCartService shoppingCartService;

	//查询购物车列表

	/**
	 * 一个shopping_cart的一个记录，只是一个购物项
	 * 多个购物项，也就是购物项的集合才是一个购物车
	 * @return List<shoppingCart>
	 */
	@GetMapping("/list")
	public R<List<ShoppingCart>> list(){
		LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();

		Long userId = BaseContext.getCurrentId();//获取当前用户的ID
		queryWrapper.eq(ShoppingCart::getUserId,userId);
		List<ShoppingCart> list = shoppingCartService.list(queryWrapper);
		return R.success(list);
	}
	/**
	 * 添加购物车
	 * @param shoppingCart
	 * @return
	 */
	@PostMapping("/add")
	public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
		log.info("购物车数据:{}",shoppingCart);

		//设置用户id，指定当前是哪个用户的购物车数据
		Long currentId = BaseContext.getCurrentId();
		shoppingCart.setUserId(currentId);

		Long dishId = shoppingCart.getDishId();

		LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
		queryWrapper.eq(ShoppingCart::getUserId,currentId);

		if(dishId != null){
			//添加到购物车的是菜品
			queryWrapper.eq(ShoppingCart::getDishId,dishId);
		}else{
			//添加到购物车的是套餐
			queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
		}

		//查询当前菜品或者套餐是否在购物车中
		//SQL:select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
		ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

		if(cartServiceOne != null){
			//如果已经存在，就在原来数量基础上加一
			Integer number = cartServiceOne.getNumber();
			cartServiceOne.setNumber(number + 1);
			shoppingCartService.updateById(cartServiceOne);
		}else{
			//如果不存在，则添加到购物车，数量默认就是一
			shoppingCart.setNumber(1);
			shoppingCart.setCreateTime(LocalDateTime.now());
			shoppingCartService.save(shoppingCart);
			cartServiceOne = shoppingCart;
		}
		return R.success(cartServiceOne);
	}
	/**
	 * 清空购物车
	 * @return
	 */
	@DeleteMapping("/clean")
	public R<String> clean(){
		//SQL:delete from shopping_cart where user_id = ?
		LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
		queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());

		shoppingCartService.remove(queryWrapper);
		return R.success("清空购物车成功");
	}
}
